Interested in doing an IL speedrun of this game but noticed that all the IL records are uploaded to soniccenter.org and not SR.com. Any possibility of an IL category any time soon?

no

KInda answered your own question there, if you want your ILs tracked you'll need to go to TSC.

Well that sucks, makes you wonder why there is even a SR.com page in the first place.

for single segment runs